Toothbrush



FIG. 1 is a perspective view of a toothbrush;

FIG. 2 is a front view thereof;

FIG. 3 is a right side view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom view thereof.

The broken lines showing the head portion of the toothbrush form no part of the claimed design. 

The ornamental design for a toothbrush, as shown and described. 